ENGLISH

Laser Doppler Vibrometry: A Multimedia Guide to its Features and Usage

By Enrico Primo Tomasini (editor) , Paolo Castellini (editor)

Book information

Publisher
Springer
Year
2020
ISBN
3662613166, 9783662613160
Language
english
Format
PDF
Filesize
9 MB (9697994 bytes)
Edition
1st ed. 2020
Pages
177\173
Time added
2020-06-30 01:06:09

Description

This book is a continuous learning tool for experienced technical staff facing laser vibrometry technology for the first time. The book covers both theoretical aspects and practical applications of laser Doppler vibrometry, and is accompanied by a multimedia presentation that allows the audience to browse the content and come as close as possible to performing real experiments. After a brief introduction, Chapter 2 presents supporting theory, providing general information on light sources, light scattering and interference for a better understanding of the rest of the book. Chapter 3 examines the theory of laser vibrometers, explaining interferometers from an optical perspective and in terms of the related electronics. It also addresses options like tracking filters and different signal demodulation strategies, since these have a significant impact on the practical use of vibrometers. Chapter 4 explores the configurations that are encountered in today’s instrumentation, with a focus on providing practical suggestions on the use of laser vibrometers. Lastly, Chapter 5 investigates metrology for vibration and shock measurements using laser interferometry, and analyses the uncertainty of laser vibrometers in depth. Preface Introduction Contents 1 Supporting Theory 1.1 Laser Sources 1.2 Doppler Effect 1.2.1 Doppler Effect: Theory 1.2.2 Variation of Doppler Effect Due to Operative Conditions 1.3 Frequency Shifting Devices for Laser Vibrometry 1.3.1 Rotating Diffraction Grating 1.3.2 Acousto-optics Modulator 1.4 Polarization Devices Used in Laser Vibrometry 1.5 Optical Fibres in Laser Vibrometry 2 Theory of Vibrometry 2.1 Optical Homodyne and Heterodyne 2.2 Interferometers 2.2.1 Michelson Interferometer 2.2.2 Mach-Zehnder Interferometer 2.2.3 Self Mixing 2.3 Processing of Optical Signal 2.3.1 Demodulation of Doppler Signals 2.3.2 Tracking Filter 2.3.3 Digital Decoding References 3 Instrumentation 3.1 Single-Point Vibrometer 3.2 Discrete Scanning Vibrometer 3.2.1 Traversing Gear on the Vibrometer or on the Object 3.2.2 Oscillating Mirrors 3.2.3 Oscillating Mirrors with Optics 3.2.4 Oscillating Thick Glasses 3.2.5 Actuators for the Scanning System 3.2.6 Management of a Scanning System 3.3 Tracking Scanning Vibrometer 3.3.1 Open-Loop Tracking LDV 3.3.2 Closed-Loop Tracking LDV—Image Based Tracking Laser Doppler Vibrometer (iTLDV) 3.4 Continuous Scanning Vibrometer 3.4.1 Straight-Line Scans 3.4.2 Circular Scanning 3.4.3 Area Scans 3.4.4 Point Measurement 3.4.5 Speckle Noise 3.5 In-Plane Vibrometer 3.6 Rotational Vibrometer 3.7 Fibre Optic Vibrometers 3.7.1 Fibre Optic Vibrometer 3.7.2 In-Fibre Vibrometer 3.8 Differential Vibrometer 3.9 Self-mixing Vibrometers 3.10 Multi-point Vibrometer 3.11 Specific Problems of Laser Vibrometry 3.11.1 Light Scattering from Surfaces and Surface Treatment 3.11.2 Light Scattering and Optical Signal: Speckle Noise and Drop-Out Noise 3.11.3 Optical Access 3.12 Laser Safety 3.12.1 Effects of Radiations on Skin and Eye 3.12.2 Laser Safety Standards and Laser Source Classification 3.12.3 Safety Procedures and Suggestions References 4 Multimedia Content

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